EP0992729B1 - Quick connector with insertion indicator - Google Patents

Quick connector with insertion indicator Download PDF

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Publication number
EP0992729B1
EP0992729B1 EP99117942A EP99117942A EP0992729B1 EP 0992729 B1 EP0992729 B1 EP 0992729B1 EP 99117942 A EP99117942 A EP 99117942A EP 99117942 A EP99117942 A EP 99117942A EP 0992729 B1 EP0992729 B1 EP 0992729B1
Authority
EP
European Patent Office
Prior art keywords
pipe
fitting
main body
slider
checker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99117942A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0992729A1 (en
Inventor
Kenji Tozaki
Masatoshi Harada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Togo Seisakusho Corp
Original Assignee
Togo Seisakusho Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Togo Seisakusho Corp filed Critical Togo Seisakusho Corp
Publication of EP0992729A1 publication Critical patent/EP0992729A1/en
Application granted granted Critical
Publication of EP0992729B1 publication Critical patent/EP0992729B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2201/00—Special arrangements for pipe couplings
    • F16L2201/10—Indicators for correct coupling

Definitions

  • This invention relates generally to a pipe fitting for connecting a metal pipe or a resin tube each having a relatively small diameter and used in automobiles, for example, and more particularly to such a pipe fitting provided with a checking member for checking normal fitting of the pipe or tube.
  • a pipe fitting of the first embodiment comprises a main body 1 made of a synthetic resin material.
  • the main body 1 is formed into a generally cylindrical shape and has a distal end (not shown) with which, for example, a synthetic resin tube is to be fitted.
  • the main body 1 is formed therein with an insertion hole 4 into which, for example, a metal pipe 2 is inserted.
  • the pipe 2 has a falling-off preventing flange 3 formed along the overall circumference thereof by way of bulging.
  • the insertion hole 4 has a stepped stopper face 5 formed on the middle of an inner wall thereof as shown in FIG. 2.
  • the hole 4 further includes a leading or guiding section 12 formed between the entrance and the middle section 6 and has a larger inner diameter than the middle section.
  • the falling-off preventing flange 3 can be inserted into the leading section 12.
  • a pair of positioning grooves 15 for a slider 13 which will be described later are formed in the inner wall of the main body 1 so as to be opposed to each other. Each positioning groove 15 extends inward from an entrance side end of the insertion hole 4 by a predetermined length.
  • the main body 1 has another pair of grooves 16 located substantially perpendicularly to the positioning grooves 15. Each groove 16 extends from the entrance side end face of the insertion hole 4 to windows 11.
  • the main body 1 has a positioning flange 9 formed on an outer circumference thereof so as to extend circumferentially.
  • the positioning flange 9 is provided for positioning a pipe retainer 17 which will be described later.
  • the positioning flange 9 extends a part of the outer circumference of the main body 1 in FIG. 1, it may be formed along the overall outer circumference of the main body.
  • the main body 1 further has a flange 10 formed along the overall circumferential end at the entrance side and having substantially the same height as the flange 9.
  • the flange 10 has four notches formed at the intervals of 90 degrees.
  • the lower notches as viewed in FIG. 1 serve as engaged grooves 1A a fitting checker 14 engages as will be described later.
  • the windows 11 are formed in portions of the outer circumference of the main body 1 between the flanges 9 and 10. The windows 11 are located substantially perpendicularly to the positioning grooves 15 and symmetrically about the axis of the main body 1.
  • a generally C-shaped pipe retainer 17 is fitted with the outer circumferential portion of the main body 1 between the flanges 9 and 10.
  • the pipe retainer 17 is formed by cutting off a part of a ring so as to be elastically deformable in a spreading direction.
  • the pipe retainer 17 is temporarily spread and attached so as to hold the main body 1 and thereafter caused to elastically return in a clamping direction to its former state, being fixed to the main body 1.
  • the pipe retainer 17 includes an operating protrusion or knob 19 formed on an end of the cut portion thereof in order that the pipe retainer may easily be spread in the attachment to the main body 1.
  • the pipe retainer 17 further has a pair of falling-off preventing protrusions 20 formed on an inner circumferential face thereof.
  • Each falling-off preventing protrusion 20 has a tapered or inclined front face 20A at the entrance side of the insertion hole 4.
  • the front face 20A is tapered outward so that each falling-off preventing protrusion 20 is readily pushed up when the falling-off preventing flange 3 passes it.
  • the slider 13 has at one of opposite ends thereof a pressed portion 21 pressed by the falling-off preventing flange 3 of the pipe 2.
  • the pressed portion 21 is formed into the shape of a ring and has such an outer diameter as to be slidable on the inner circumference of the leading section 12 and such an inner diameter that a portion of the pipe 2 except the flange 3 is inserted therethrough.
  • the slider 13 has at the other end thereof a pressing portion 18 formed into the shape of a ring similar to that of the flange 10 of the main body 1.
  • the pressing portion 18 has four notches or engaged grooves 18A formed on the outer circumference at the intervals of 90 degrees so as to match the grooves 1A respectively.
  • a fitting checker 14 engages two lower grooves 18A in FIG.
  • the slider 13 further includes two axially extending connecting pieces 23 interconnecting the pressed portion 21 and the pressing portion 18.
  • the connecting pieces 23 are adapted to be inserted into the positioning grooves 15 of the main body 1 respectively.
  • the fitting checker 14 includes a pair of legs 24 flexible so as to depart from each other and a curved piece 25 interconnecting upper ends of the legs 24.
  • the fitting checker 14 further includes an operating ring 26 standing from an upper side of the curved piece 25 near one end of the latter.
  • Each leg 24 has an engaging claw 22 formed on the lower inside thereof. The claws 22 of the legs 24 engage the grooves 1A and 18A of the main body 1 and the slider 13 respectively, as described above, so that the fitting checker 14 is mounted on both of the main body 1 and the slider 13 so as to be disallowed to be pulled out axially.
  • Each leg 24 of the fitting checker 14 has a releasing protrusion 27 formed on the inside thereof so as to be located over the corresponding engaging claw 22.
  • both protrusions 27 are located between the flange 10 of the main body 1 and the pressing portion 18 of the slider 13 so that the axial movement of the fitting checker 14 is limited.
  • the protrusions 27 have inclined front faces 27A respectively, which faces are opposed to the pressing portion 18 of the slider 13. The inclined faces 27A are brought into a sliding contact with the pressing portion 18 to thereby guide the respective legs 24 in a spreading operation.
  • the falling-off preventing flange 3 presses the pressed portion 21 of the slider 13 until completely passing the falling-off preventing protrusions 20.
  • the edge of the pressing portion 18 of the slider 13 moves up onto tops 27B of the releasing protrusions 27 of the fitting checker 14 as shown in FIG. 6, when the legs 24 are spread widest. Only when the legs 24 assume the above-described position, the claws 22 are allowed to disengage from the respective grooves 1A and the respective grooves 18A. In other words, the fitting checker 14 can be pulled out only when the pipe 2 has been inserted to reach the normal depth thereof.
  • the pipe fitting will be described.
  • the slider 13, the fitting checker 14 and the pipe retainer 17 are assembled to the main body 1 as shown in FIG. 2.
  • the pipe 2 is inserted into the insertion hole 4 from the entrance side of the latter.
  • the pipe 2 is moved forward with the flange 3 sliding along the inner wall of the insertion hole 4.
  • the flange 3 then abuts the falling-off preventing protrusions 20 of the pipe retainer 17 projecting through the respective windows into the insertion hole 4 as shown in FIGS. 3 and 4.
  • the pipe retainer 17 is spread by the guiding of the tapered faces 20A of the protrusions 20 so that the protrusions 20 are moved outward.
  • the claws 22 of the fitting checker 14 are released from the engagement with the respective grooves 1A of the main body 1 and the respective grooves 18A of the slider 13 in this way. Accordingly, the fitting checker 14 can be pulled out when the operating ring 26 is drawn radially outward. By the fact that the fitting checker 14 is pulled out, the workman can find that the pipe 2 has been inserted to reach the normal depth thereof.
  • whether the pipe 2 has normally been inserted can be understood by finding whether the fitting checker 14 can be pulled out.
  • the fitting checker 14 is attached to the main body of the pipe fitting from outside without provision of the conventional opening. Consequently, a large opening is not left in the main body 1 after the check of normal insertion of the pipe 2 and accordingly, the foreign matter such as dust can effectively be prevented from entering the main body 1 of the pipe fitting.
  • the claws 22 of the fitting checker 14 engage the respective grooves 1A of the main body 1 and the respective grooves 18A of the slider 13. Consequently, the fitting checker 14 can be prevented from an inadvertent detachment and accordingly, the reliability of the checking function of the fitting checker 14 can be improved.
  • the main body 1 has the open windows through which the falling-off preventing protrusions 20 of the pipe retainer 17 are inserted respectively, the windows are closed as the result of attachment of the pipe retainer 17. Consequently, the foreign matter such as dust can be prevented from entering the main body 1 through the windows.
  • FIGS. 9 to 14 illustrate a second embodiment of the invention.
  • the claws 22 of the fitting checker 14 engage both the main body 1 and the pressing portion 18 of the slider 13 in the foregoing embodiment. In the second embodiment, however, the claws 22 engage only the main body 1 of the pipe fitting.
  • Each of the main body 1 and the pipe retainer 17 has the same construction as that in the foregoing embodiment. Accordingly, the identical or similar parts in the second embodiment are labeled by the same reference symbols as in the first embodiment and the description of these parts will be eliminated.
  • the pressing portion 18 of the slider 13 has no engaged grooves and is formed into an annular shape. An outer diameter of the pressing portion 18 is larger than the diameter of the insertion hole 4 and an inner diameter of the fitting checker 14 .
  • the pressing portion 18 of the slider 13 is disposed outside the main body 1 and the fitting checker 14.
  • the fitting checker 14 includes legs 24A integrally formed into the shape of an arc so that the fitting checker is fitted with the outer circumference of the flange 10 of the main body 1. Each leg 24A has a width larger than the flange 10.
  • the fitting checker 14 has a plurality of limiting edges 28 formed on one of two inner circumferential edges of the legs 24A so as to protrude radially inward. The limiting edges 28 engage an axial inside face of the flange 10.
  • the fitting checker 14 further has a pair of releasing protrusions 27 formed on the other inner circumferential edges of the legs 24A near distal ends of the legs. One of the releasing protrusions 27 is shown in FIG. 9.
  • each releasing protrusion 27 is pushed up by the pressing portion 18 of the slider 13 when the pipe 2 has been inserted to reach the normal depth and the slider 13A has been thrust into a predetermined position.
  • each releasing protrusion 27 has an inclined front face 27A.
  • the other construction of the pipe fitting of the second embodiment is the same as that in the foregoing embodiment.
  • the flange 3 presses the pressed portion 21 of the slider 13A when passing the protrusions 20.
  • the slider 13A is displaced to a position shown in FIG. 13 or 14.
  • the pressing portion 18 of the slider 13A is brought into a sliding contact with the inclined faces 27A of the releasing protrusions 27 so that the legs 24A of the fitting checker 14 are gradually spread.
  • the outer circumferential edge of the pressing portion 18 moves up the tops 27B of the releasing protrusions 27 as shown in FIG. 14, when the legs 24A are spread widest.
  • the claws 22 of the fitting checker 14 are released from the engagement with the respective grooves 1A of the main body 1 and the respective grooves 18A of the slider 13 in this way. Accordingly, the fitting checker 14 can be pulled out when the operating ring 26 is drawn radially outward. By the fact that the fitting checker 14 is pulled out, the workman can find that the pipe 2 has been inserted to reach the normal depth thereof.
  • FIG. 15 illustrates a third embodiment of the invention.
  • the rear edge of the fitting checker 14 extends in the rear of the releasing protrusions 27, thereby serving as an annular protecting edge 24B.
  • the protecting edge 24B projects in the rear of the pressing portion 18 of the slider 13B.
  • the number of occasions where the slider 13B is subjected to a direct external force can be reduced and accordingly, the slider 13B can be prevented from being inadvertently thrust deep into the main body 1.
  • the other construction of the pipe fitting of the third embodiment is the same as that of each of the first and second embodiments. Consequently, the same effect can be achieved from the third embodiment as from the first and second embodiments.
  • FIGS. 16 to 24 illustrate a fourth embodiment of the invention.
  • a protector 52 is provided for preventing the slider 13A from being inadvertently thrust into the legs 51 of the fitting checker 50. More specifically, since the engagement portion of the slider is exposed at the rear end thereof in each of the foregoing embodiments, there is a possibility that the pipe may not be inserted along the axis of the insertion hole. If the pipe should be inserted obliquely into the insertion hole, the distal end of the pipe would butt the engagement portion of the slider. In this case, the slider is thrust in so that the legs of the fitting checker spread, whereupon the engaging claws of the fitting checker disengage from the main body 1 side.
  • the fourth embodiment is directed to a solution of the above-described problem, namely, to a more reliable detection of the incomplete insertion of the pipe.
  • the pipe fitting of the fourth embodiment has the same construction as that of the second embodiment except the fitting checker 50. Accordingly, the identical or similar parts in the fourth embodiment are labeled by the same reference symbols as in the second embodiment and the description of these parts will be eliminated.
  • the fitting checker 50 has the protector 52 formed to inwardly project out of the circumferential edge opposed to the limiting edges 54, as shown in FIG. 18.
  • a central lower portion of the protector 52 is cut out as shown at 60 in FIG. 18 and upper two symmetrical regions thereof each of which has a predetermined angular range are cut off as shown at 57 in FIG. 18.
  • two portions between the respective cut-off portions 57 and a central circular hole 59 are cut out as shown at 58 in FIG. 18. Consequently, the protector 52 is split into three pieces.
  • the central hole 59 has an inner diameter set so that the flange 3 of the pipe 2 can loosely be inserted therethrough.
  • the connecting work is carried out in the same manner as described in the second embodiment.
  • the fitting checker 50 can be pulled out when the pipe 2 has been inserted into the insertion hole 4 to reach the normal depth thereof.
  • the fitting checker 50 cannot be pulled out, whereby the workman finds that the pipe 2 has incompletely been inserted.
  • the checking function of the fitting checker in addition to preventing dust from invasion into the main body 1, the checking function of the fitting checker can be prevented from being damaged by the oblique insertion of the pipe 2. Consequently, the incomplete insertion can reliably be detected.
  • the protector 52 of the fitting checker 50 has two requirements, namely, allowing the legs 51 to spread and covering the pressing portion 18 of the slider 13A.
  • the protector 52 can be modified only if these requirements are met.
  • FIG. 25 shows a fitting checker 70 as a modified form.
  • the protector 61 has three upper cutout portions 58, instead of two. This further facilitates spreading of the legs and reduces an insertion resistance of the pipe 2 accordingly, resulting in a reduction in an inserting load.
  • the inserting load can be adjusted according to the number of divided pieces.
  • FIG. 26 shows a fitting checker 71 as another modified form.
  • the upper portion of the protector 72 has only two slits but no cutout portions. In this case, the inserting load is adjusted so as to become large.
  • FIGS. 27 to 34 illustrate a fifth embodiment.
  • the fitting checker 80 is detachable axially with respect to the main body 1 in the fifth embodiment.
  • the fitting checker is detachable radially in each of the first to fourth embodiments.
  • a working space for drawing out the fitting checker cannot sometimes be secured radially outward depending upon the working environment.
  • the fifth embodiment is directed to a solution for this problem, that is, the construction in which the fitting checker 80 is drawn out axially with respect to the main body 1.
  • the fitting checker 80 includes a ring-shaped base 81 having a circular opening 80A with such a diameter that the pipe 2 is inserted therethrough.
  • the base 81 is opposed to the rear face of the pressing portion 18 of the slider 13B in a coaxial relation therewith.
  • a pair of legs 82 protrude from respective symmetrical locations on the outer circumferential edge of the base 81 axially toward the pipe retainer 17 with respect to the main body 1.
  • the legs 82 have engaging claws 83 extending inward from the distal ends respectively.
  • the claws 83 engage and disengage from the inside of the flange 10 of the main body 1, thereby preventing the fitting checker 80 from axially falling off from the main body.
  • Each leg 82 has a releasing protrusion 84 formed on the central inside thereof.
  • Each releasing protrusion 84 is located between the pressing portion 18 of the slider 13B and the flange 10 of the main body 1.
  • Each releasing protrusion 84 has a face opposed to the pressing portion 18 of the slider 13B and serving as an inclined face 85.
  • the slider 13B moves ahead with advancement of the pipe 2, so that the pressing portion 18 slides along the inclined faces 85.
  • each leg 82 elastically deforms in a rising direction about a portion thereof around its root.
  • each leg 82 rises uppermost so that the engaging claws 83 are allowed to disengage from the flange 10.
  • Two positioning pieces 86 arcuately project from portions of the outer circumferential edge of the base 81 between the legs 82 toward the pipe retainer 17.
  • the positioning pieces 86 are located symmetrically and have respective distal ends abutting the rear end face of the flange 10 to thereby limit the forward movement of the fitting checker 80.
  • a notch 87 is formed in the central distal end of each positioning piece 86.
  • a pair of positioning protrusions 88 protrude axially outward from the outer circumferential edge of the pressing portion 18 of the slider 13B so as to correspond to the respective notches 87.
  • the positioning protrusions 88 are displaced about 90 degrees relative to the connecting portions 23.
  • the positioning protrusions 88 fit into the respective notches 87 so that the fitting checker 80 is prevented from rotation.
  • the operation of the pipe fitting of the fifth embodiment will be described.
  • the pipe 2 is moved forward in the insertion hole 4 when fitted into it from behind the fitting checker 80 along the axis.
  • the flange 3 of the pipe 2 slides on the falling-off preventing protrusions 20 of the pipe retainer 17 until the pipe 2 reaches the normal insertion position. Accordingly, the protrusions 20 move outward when subjected to a spreading deformation of the pipe retainer 17, as shown in FIG. 31.
  • the pipe retainer 17 then elastically returns to its former state such that the protrusions 20 are positioned behind the flange 3, whereby the pipe 2 is prevented from falling off as shown in FIG. 33.
  • the flange 3 presses the pressed portion 21 to move the slider 13B forward immediately after having passed the protrusions 20.
  • the pressing portion 18 of the slider 13B slides on the inclined faces 85 of the respective releasing protrusions 84 of the fitting checker 80.
  • the fitting checker 80 is pushed forward such that the distal ends of the legs 82 are pushed against the confronting side edge of the pipe retainer 17, whereupon the fitting checker 80 is raised about its portions around the roots of the legs 82 while slightly flexing outward, as shown in FIG. 32.
  • the claws 83 of the legs 82 disengage from the flange 10 of the main body 1. Consequently, a spring force of the legs 82 drives the fitting checker 80 outward such that the fitting checker disengages from the main body 1.
  • the construction of the fifth embodiment is advantageous when a sufficient working space for drawing out the fitting checker cannot be secured radially outward. Since the other construction of the pipe fitting of the fifth embodiment is the same as that in each of the foregoing embodiments, the same effect can be achieved from the fifth embodiment as that from each of the foregoing embodiments.
EP99117942A 1998-09-17 1999-09-15 Quick connector with insertion indicator Expired - Lifetime EP0992729B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP26362898 1998-09-17
JP26362898 1998-09-17
JP32690798 1998-11-17
JP32690798 1998-11-17
JP19787499 1999-07-12
JP19787499A JP4462671B2 (ja) 1998-09-17 1999-07-12 管継手

Publications (2)

Publication Number Publication Date
EP0992729A1 EP0992729A1 (en) 2000-04-12
EP0992729B1 true EP0992729B1 (en) 2004-01-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99117942A Expired - Lifetime EP0992729B1 (en) 1998-09-17 1999-09-15 Quick connector with insertion indicator

Country Status (4)

Country Link
US (1) US6328344B1 (ja)
EP (1) EP0992729B1 (ja)
JP (1) JP4462671B2 (ja)
DE (1) DE69914432T2 (ja)

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Also Published As

Publication number Publication date
DE69914432T2 (de) 2004-11-04
US6328344B1 (en) 2001-12-11
DE69914432D1 (de) 2004-03-04
JP2000213679A (ja) 2000-08-02
EP0992729A1 (en) 2000-04-12
JP4462671B2 (ja) 2010-05-12

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